Silencer for internal combustion engines



Feb. 25, 1936- K, F

SILENQER FOR INTERNAL COMBUSTION ENGINES Filed Jan. 9, 1935 /rwen2or: KURT Th5) fitavvl'm Patented Feb. 25, 1936 PATENT OFFICE SILENCER FOB INTERNAL COMBUSTION ENGINES Kurt Frey, Oranienburg, near Berlin, Germany,

assignor to Degea. Aktiengesellsohaft (Auergesellschaft) Berlin, Germany, a corporation of Germany Application January 9; 1935, Serial No. 9'70 InGermany March 26, 1934 2 Claims.

It is well known that felt or cotton-wool like inorganic materials, such as glass cotton-wool or slag-wool, possessa high sound-absorbing property. This property has already been utilized} 5 also for the silencing or damping of the noise of the exhaust in internal combustion engines. For

' that purpose the exhaust gases were caused either to pass'along some surfaces lined with material of that kind, or they were led through filters con- 10 sisting oi such materials. In the former case the muiiiing of the soundis'not particularly good, in the latter instance an increase of the resistance will take place, which in turn will cause a reduc tion of the emciency of the motor. At the same 16 time there is the danger of obstruction through soot and oil fumes.

It has now been ascertained that a way may be I chosen between these two extreme cases, which will result in an arrangement, which will pro- 2 duce an extraordinarily efllcient silencing effect 0 exhaust. These corpuscles, which may be of any desired form (circular, cylindrical and perhaps also tube-like) and which may be of entirely different dimensions according to the size of the silencer, which again is dependent on the'motor power, are accommodated within. a-tube of an arbitrarily large and shaped cross-section betweentwoperforatedplatesinsuchamanner that they will become stable towards shaking.

Theuhaustgaseswillpassthroughtheinter-' 'sticesbetweentheindividualfillingcorpmcles.

The sound is perfectly absorbed by said fillers.

and the gases will no longer leave the silencer by jerks, since they are compelled to pass between thenumerous branches of the said fillers, but they will pass out in a uniform steady fiow and a perfectly without any noise.

A preferred construction of the invention is shown in the drawing by way of example.

Referring to the drawing, a designates a silencer having perforated plates b, and c respectively. The spherical fillers d are surrounded by wire netting e, or in other words are each enclosed within a foraminated fire-proof container e.

1. A silencer for internal combustion engines comprising a tube of predetermined cross-section having an inlet and an outlet, two perforated plates arranged within said tube in spaced relation to each other, a plurality of filling bodies of inorganic fibrous sound-absorbing material located within said tube between said plates. said filling bodies being of predetermined shape to provide intersticu between adjacent bodies, and individual foraminated fire-proof containers each independently enclosing one of said filling bodies to substantially preserve the predetermined shape thereof.

2. A silencer for internal combustion engines comprising a. tube of predetermined cross-section having an inlet and an outlet, two perforated plates arranged within said tube in spaced relation to each other, a plurality of filling bodies of sound-absorbing slag-wool located within said tube between said plates, said filling bodies being of predetermined shape toprovide interstices between adjacent bodies, and individual wirenetting containers each independently enclosing one of said filling bodies to substantially preserve the predetermined shape thereof.

. j KURT m. 440 

